A new totalsynthesis of forskolin 1 has been achieved and this note describes the synthesis of the trans fused enone 18 as a key-intermediate. Key steps are: 1) the intramolecular Diels-Alder reaction of 7 to afford the tricyclic lactone 8 (48–56%); 2) a stereospecific and regiospecific one-pot conversion of 11A into 12 (94%) with LiBH4/BF3-THF at room temperature. The scheme allows a very early stereospecific
An intramolecular Diels–Alder strategy to forskolin
作者:K. C. Nicolaou、Wen Sen Li
DOI:10.1039/c39850000421
日期:——
A strategy for the construction of the AB ring system of forskolin based on a novel intramolecularDiels–Alder reaction is reported.
据报道,一种基于新型分子内Diels-Alder反应的福斯高林AB环系统的构建策略。
An approach to forskolin an efficient synthesis of a tricyclic lactone intermediate
作者:Tsung-Tee Li、Yu-Lin Wu
DOI:10.1016/s0040-4039(00)80411-6
日期:1988.1
Tricyclic lactone 10, a potential intermediate for the synthesis of forskolin, was prepared from (±)-3-hydroxycyclocitral employing an intramolecular Michael addition as the key step.